342 BOTANICAL GAZETTE [APRIL 
Turneraceae describing new species in a (2) and Turnera (3) from 
South America.—H. F. Wernuam (Jour. Bot. 51:320-324. 1913) under 
““New Rubiaceae from Tropical America 11” has published 10 new species.— 
©. Wince (Arkiv fér Botanik 12: no. 9. pp. 1-39. pls. 1-13. 1913) under the 
title ‘Cytological studies in the Plasmodiophoraceae”’ includes a description 
of a new genus and species (Sorodiscus Callitrichis Lagerh. and Winge) found on 
stems of Callitrichis vernalis—H. W. WoLLENWEBER (Phytopathology 3: 
197-242. pls. 20-22. 1913) characterizes a new genus (Cylindrocarpon) based on 
Nectria cucurbitula (Tode) Fries—N. Worontcutn (Monit. Jard. Bot. Tiflis, 
Livr. 28. pp. 16-25. 1913) has published several new species of parasitic fungi 
including a new genus (Echinosporium) found on leaves of Acer Pseudoplatanus 
L. in the Caucasus region—K. YeNpo (Nyt Mag. f. Naturv. 51:275-288. 
pls. 13, 14. 1913) under the title ‘Some new algae from Japan” describes and 
illustrates a new genus and species of parasitic alga, namely Benzaitenia yeno- 
shimensis. The same author (Trav. Mus. Bot. and Acad. Imp. Sci. St. Péters- 
bourg 10:114-121. 1913) presents a discussion of Haplosiphon filiformis 
Rupr. and proposes a new genus (Ruprechtiella), based on a part of RUPRECHT’S 
material in the Herbarium of the Academy of Science in St. Petersburg.— 
GREENMAN. 
Tree growth.—Measuring the growth in height of over 40 specimens of 
Pinus ponderosa for the five years of 1909-1913, and attempting to sane 
these increments with the precipitation during the growing period, KIRKW 
concludes that the amount of growth is determined principally by the metas 
conditions of the preceding growing season. This he shows to be directly in 
harmony with the fact that the time of increase in height and thickness in trees 
is limited to the first few weeks of the growing season. His quantitative data 
seem to warrant such a conclusion, at least for regions of limited rainfall, where 
the seasons of maximum precipitation would approach most nearly to the 
optimum requirements of the tree. 
Investigations of a somewhat similar nature by Jaccarp® include obser- 
vations upon a small number of individuals of several different species during 
the growing seasons of 1911 and 1912. The former was the warmer, drier 
year, and showed a greater increase in thickness in three examples compared 
with six examples exhibiting the greater increment in the latter year. He also 
shows that the period in which most of the increase in size is accomplished is 
during the first half of the season, or more exactly from May until the middle 
of July. He makes no attempt to trace the connection between the grow 
of one season with the weather conditions of the previous year. 
7 Kirkwoop, J. E., The influence of preceding growing season on the growth 
of the yellow pine. Torreya 14:115-125. 1914. 
8 JaccarD, P., Accroisement en ee de Saas coniféres en I191I-I9t?- 
Jour. Forestier Sacleaa: nos. 6, 7, 8. pp. I-20. 1913 
